One of the greatest challenges faced by William Clark and Meriwether Lewis on their 1804-6 Corps of Discovery expedition was that of medical emergencies on the trail. Without an attending physician, even routine ailments and injuries could have tragic consequences for the expedition's success and the safety of its members. Of these dangers, the most insidious and potentially devastating was the slow, painful, and oftentimes fatal ravage of venereal disease. Physician Thomas P. Lowry delves into the world of nineteenth-century medicine, uncovering the expedition's ver